Being a staunch Dumptyist, I'm of the opinion that words ultimately mean what the user intends them to mean whether we like it or not, but I'm not entirely clear just what is meant by atheism and agnosticism here. I can't imagine a sane atheist who would not be persuaded by clear evidential proof, yet such a person seems to be classed here as an agnostic. Distinguishing between the two using the criterion of willingness to believe looks rather meaningless to me.